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ekstra   ara
 Post subject: Fault current option using ETAP
PostPosted: Thu Apr 26, 2018 4:24 pm 

Joined: Thu Apr 26, 2018 4:05 pm
Posts: 4
There are two options ETAP can use for calculating bolted fault current. One is the symmetrical ½ cycle momentary and the other is symmetrical 1.5 to 4 cycle interrupting fault current. Which fault current is more appropriate for arc flash studies and does it depend on the voltage level?


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 Post subject: Re: Fault current option using ETAP
PostPosted: Wed Oct 03, 2018 6:41 pm 

Joined: Fri Jun 22, 2018 8:26 am
Posts: 6
It depends on what is sourcing the fault current. If you do not have synchronous generators or induction motors present in your model, the 1/2 and 1.5 to 4 cycle should be the same. If you do have them in the model, it would be a good idea to see which option will have the higher incident energy.


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